Setting the Timeout for Fault Monitor Probes

The timeout for fault monitor probes specifies the length of time that a fault monitor waits for a response from a resource to a probe. If the fault monitor does not receive a response within this timeout, the fault monitor treats the resource as faulty. The time that a resource requires to respond to a fault monitor probe depends on the operations that the fault monitor performs to probe the resource.

During a probe, the SAP DB fault monitor performs the following operations:

1. The SAP DB fault monitor determines whether the SAP DB database instance is online.

2. If the SAP DB database instance is online, the SAP DB fault monitor determines whether the parent kernel process of the SAP DB database instance is running.

3. The SAP DB fault monitor determines whether SAP xserver is available. This fault monitoring supplements the fault monitoring that the SAP xserver fault monitor provides.

During a probe, the SAP xserver fault monitor determines whether SAP xserver is available.

The time that is required for a resource to respond also depends on factors that are unrelated to the fault monitor or the application, for example:

• System configuration

• Cluster configuration

• System load

• Amount of network traffic

To set the timeout for fault monitor probes, set the Probe_timeout extension property to the timeout in seconds that you require. Set this property for each resource that contains a Sun Cluster HA for SAP DB fault monitor that you need to tune. The resource types of these resources are shown in Table 1–3.